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Bluetooth: Add skeleton for Attribute Protocol handling

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This patch adds support for the ATT fixed channel. A dedicated att.c
file is added to handle the ATT protocol handling.

Change-Id: I2e481f56168b6f1b4c564f10d25dee0a85fb968f
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2015-04-28 10:44:37 +03:00 • committed by Anas Nashif
commit 33c50f332b
3 changed files with 152 additions and 0 deletions
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92
net/bluetooth/att.c Normal file
View file

@ -0,0 +1,92 @@
/* att.c - Attribute protocol handling */
/*
* Copyright (c) 2015 Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2) Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3) Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <nanokernel.h>
#include <toolchain.h>
#include <string.h>
#include <errno.h>
#include <misc/byteorder.h>
#include <bluetooth/hci.h>
#include <bluetooth/bluetooth.h>
#include "hci_core.h"
#include "conn.h"
#include "l2cap.h"
#include "att.h"
static void send_err_rsp(struct bt_conn *conn, uint8_t req, uint16_t handle,
uint8_t err)
{
struct bt_att_error_rsp *rsp;
struct bt_att_hdr *hdr;
struct bt_buf *buf;
buf = bt_l2cap_create_pdu(conn, BT_L2CAP_CID_ATT,
sizeof(*hdr) + sizeof(*rsp));
if (!buf)
return;
hdr = (void *)bt_buf_add(buf, sizeof(*hdr));
hdr->code = BT_ATT_ERROR_RSP;
rsp = (void *)bt_buf_add(buf, sizeof(*rsp));
rsp->request = req;
rsp->handle = sys_cpu_to_le16(handle);
rsp->error = err;
bt_conn_send(conn, buf);
}
void bt_att_recv(struct bt_conn *conn, struct bt_buf *buf)
{
struct bt_att_hdr *hdr = (void *)buf->data;
if (buf->len < sizeof(*hdr)) {
BT_ERR("Too small ATT PDU received\n");
goto done;
}
BT_DBG("Received ATT code %u len %u\n", buf->len);
bt_buf_pull(buf, sizeof*hdr);
switch (hdr->code) {
default:
BT_DBG("Unhandled ATT code %u\n", hdr->code);
send_err_rsp(conn, hdr->code, 0, BT_ATT_ERR_NOT_SUPPORTED);
break;
}
done:
bt_buf_put(buf);
}

56
net/bluetooth/att.h Normal file
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@ -0,0 +1,56 @@
/* att.h - Attribute protocol handling */
/*
* Copyright (c) 2015 Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2) Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3) Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
struct bt_att_hdr {
uint8_t code;
} PACK_STRUCT;
#define BT_ATT_ERR_NOT_SUPPORTED 0x06
#define BT_ATT_ERROR_RSP 0x01
struct bt_att_error_rsp {
uint8_t request;
uint16_t handle;
uint8_t error;
} PACK_STRUCT;
#define BT_L2CAP_ATT_EXCHANGE_MTU_REQ 0x02
struct bt_att_exchange_mtu_req {
uint16_t mtu;
} PACK_STRUCT;
#define BT_L2CAP_ATT_EXCHANGE_MTU_RSP 0x03
struct bt_att_exchange_mtu_rsp {
uint16_t mtu;
} PACK_STRUCT;
void bt_att_recv(struct bt_conn *conn, struct bt_buf *buf);

4
net/bluetooth/l2cap.c
View file

@ -10,6 +10,7 @@
#include "hci_core.h"
#include "conn.h"
#include "l2cap.h"
#include "att.h"
#define LE_CONN_MIN_INTERVAL 0x0028
#define LE_CONN_MAX_INTERVAL 0x0038
@ -138,6 +139,9 @@ void bt_l2cap_recv(struct bt_conn *conn, struct bt_buf *buf)
case BT_L2CAP_CID_LE_SIG:
le_sig(conn, buf);
break;
case BT_L2CAP_CID_ATT:
bt_att_recv(conn, buf);
break;
default:
BT_ERR("Ignoring data for unknown CID %u\n", cid);
bt_buf_put(buf);